PRESSURE VACUUM CONVERSION FACTORS Multiply by To Obtain Multiply by To Obtain at 0.967841 atm in Hg (0°C) 0.033421 atm atm 1.0132501 bar in Hg (0°C) 0.0833334 ft H2O (4°C) atm 1033.2276 gf/cm2 in Hg (0°C) 13.5951 in H2O (4°C) atm 33.898539 ft H2O (4°C) in Hg (0°C) 3.38638 kPa atm 406.64355 in H2O (4°C) in Hg (0°C) 0.0345315 kgf/cm2 atm atm 29.92469 1.0332275 in Hg (0°C) kgf/cm2 in Hg (0°C) in Hg (0°C) 345.31466 70.726017 kgf/m2 lb/ft2 (dif) atm 10332.275 kgf/m2 in Hg (0°C) 33.863887 mbar atm atm atm atm atm 101.32501 14.695949 kPa psi (dif) in Hg (0°C) in Hg (0°C) 25.4 0.4911529 mm Hg (0°C) psi (dif) 68087.256 760.0021 14.69595 lb/ft2 (dif) mm Hg (0°C) psi (dif) kgf/cm2 kgf/cm2 kgf/cm2 0.9678411 98.0665 14.223343 atm kPa psi (dif) bar 401.46308 in H2O (4°C) kPa 0.0098692 atm bar bar bar 29.529983 100 14.503774 in Hg (0°C) kPa psi (dif) kPa kPa kPa 4.0146308 0.2952998 0.1450377 in H2O (4°C) in Hg (0°C) psi (dif) cm Hg (0°C) 5.3525345 in H2O (4°C) mbar 0.0145038 psi (dif) cm Hg (0°C) 0.4460451 ft H2O (4°C) oz/in2 0.0625 psi (dif) cm Hg (0°C) cm Hg (0°C) cm Hg (0°C) 1.33322 0.1933672 27.844879 kPa psi (dif) lb/ft2 (dif) psia psia psia 0.068046 70.306958 6.8947573 atm gf/cm2 kPa cm Hg (0°C) 0.0135951 kgf/cm2 psia 27.679905 in H2O (4°C) ft H2O (4°C) 0.0294989 atm psia 2.0360207 in Hg (0°C) ft H2O (4°C) 0.8826452 in Hg (0°C) psi (dif) 0.068046 atm ft H2O (4°C) 0.4335149 psi (dif) psi (dif) 68.947573 mbar ft H2O (4°C) 62.426145 lbf/ft (dif) psi (dif) 70.306958 gf/cm2 ft H2O (4°C) 2.98898 kPa psi (dif) 2.3067258 ft H2O (4°C) in H2O (4°C) 0.249082 kPa psi (dif) 27.679905 in H2O (4°C) in H2O (4°C) 0.0735539 in Hg (0°C) psi (dif) 6.8947573 kPa in H2O (4°C) 0.0361273 psi (dif) Torr 0.0013158 atm in H2O (4°C) 5.2021857 lb/ft2 (dif) Torr 0.0393701 in Hg (0°C) 2 Abbreviations Key at … technical atm dif … differential in … inch mbar … millibar atm … standard atmosphere Ba … barye bar … bar ft … foot ft2… square foot gf … gram-force in … square inch lb … pound kgf … kilogram-force m2… square meter mm … millimeter oz … ounce cm … centimeter H2O … water kPa … kilopascal psi … lb per in2 cm2… square centimeter Hg … mercury lbf… pound-force psi (dif) … aka psid 2